[PATCH 2/2] UBUNTU: SAUCE: vt -- allow grub to request automatic vt_handoff

[Andy Whitcroft]

Grub may be able to select a graphics mode and paint a splash screen
for us.  If so it needs to be able to tell us it has done so.  Add
support for detecting a new graphics mode selected bit in the
screen_info passed over at boot.  Use this to automatically enable
vt_handoff mode.

Signed-off-by: Andy Whitcroft <apw at canonical.com>
---
 drivers/char/vt.c           |    6 ++++++
 include/linux/screen_info.h |    1 +
 2 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 2c64292..09f5632 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -2885,6 +2885,12 @@ static int __init con_init(void)
 	struct vc_data *vc;
 	unsigned int currcons = 0, i;
 
+	if (screen_info.flags & VIDEO_FLAGS_HANDOFF) {
+		printk(KERN_INFO "vt handoff: grub requested handoff (vt#8)\n");
+		if (vt_handoff == -1)
+			vt_handoff = 8;
+	}
+
 	acquire_console_sem();
 
 	if (conswitchp)
diff --git a/include/linux/screen_info.h b/include/linux/screen_info.h
index 899fbb4..e699dd4 100644
--- a/include/linux/screen_info.h
+++ b/include/linux/screen_info.h
@@ -67,6 +67,7 @@ struct screen_info {
 #define VIDEO_TYPE_EFI		0x70	/* EFI graphic mode		*/
 
 #define VIDEO_FLAGS_NOCURSOR	(1 << 0) /* The video mode has no cursor set */
+#define VIDEO_FLAGS_HANDOFF	(1 << 1) /* Video buffer is alredy painted */
 
 #ifdef __KERNEL__
 extern struct screen_info screen_info;
-- 
1.7.0.4